1. **Stating the problem:** A box contains 4 bags of sugar. We want to find the total amount of sugar in the box if each bag contains a certain amount of sugar. 2. **Formula used:** The total amount of sugar is calculated by multiplying the number of bags by the amount of sugar in each bag. $$\text{Total sugar} = \text{Number of bags} \times \text{Sugar per bag}$$ 3. **Explanation:** If each bag contains $x$ units of sugar, then for 4 bags, the total sugar is $4 \times x = 4x$. 4. **Intermediate work:** Since the problem does not specify the amount of sugar per bag, the total sugar is expressed as $4x$. 5. **Final answer:** The total amount of sugar in the box is $$4x$$ where $x$ is the amount of sugar in one bag. This formula can be used to find the total sugar once the amount per bag is known.